Chaser adjusting means



Oct.` 23, 1945; D; R. 'POWELL ErAL CHASER ADJUSTING MEANS Filed Aug. 19, 1943 Patented Oct. 23, 1945 CHASER ADJUSTING MEANS Davids. Powell and William L. Moore, cleveland,

Ohio, assignors to The National Acme Company, Cleveland, Ohio, a corporation of Ohio Application August 19, 1943, Serial No. 499,174

11 Claims.

This invention relates to threading tools such as taps and dies and, more particularly, to chaser adjusting means therefor, the principal object being the provision of a floating or self-centering bushing carried by the die head for insuring the proper engagement of the adjusting member with the die head and which will be simple in construction, eicient in use and inexpensive to manufacture and which will also permit increased accuracy in the operation of the die.

Other advantages will be apparent from the following detailed description.

In the drawing accompanying and forming a part of this specification,

Fig. 1 is a vertical sectional view of the die head.

Fig. 2 is an enlarged section illustrating the floating connection between the die body and the adjusting member.

Fig. 3 is a similar view taken at right angles to Fig. 2.

Fig. 4 is a section taken on line 4-4 of Fig. 3.

Fig. 5 is a perspective view of the adjusting ring.

Fig. 6 is a partial detail View of the bushing and its connection with the adjusting ring, and Fig. 7 is a section taken on line --l of Fig. 6.

Similar characters of reference indicate corresponding parts in the several views.

Before explaining in detail the present improvement and its mode of operation, we desire to have it understood that the invention is not limited to the details of construction and arrangement of parts illustrated in the accompanying drawing since the invention is capable of other embodiments, and that the phraseology employed is for the purpose of description and not of limitation.

This invention is an improvement in the means for connecting the adjusting ring to the die body and for a general description of the operation of the die, reference may be had to the William J. Hogg Patent No. 1,952,295,l assigned to The National Acme Company, and only so much of the die will be shown and described as is deemed necessary herein to enable a clear understanding of the construction and operation of the present improvement.

The die comprises a slotted body 2 having a shank 3 for attachment to the usual holding means of a threading machine, and upon this body is located a shiftable cap or housing 4 which may be equipped with any suitable means (not shown) for shifting it back and forth on vIt() the die body to effect opening and closing of the chasers.

The cap 4 is provided with suitable cam surfaces 5 for cooperation with suitable cam sur,1 faces 3 of chaser blocks 'l carried in T-slots 1" of the die body and adapted to carry in any suitable manner the chasers 8. The cooperation of the cam surfaces 5 and 6 effects opening and closing of the chasers and also the proper setting thereof for threading operations. Located within the cap 4 is an adjusting ring 9 provided with a lguide pin IU in position to project into an opening Il in the rear wall of the body.

Heretofore, as in 'the patent referred to, the hole in the body and the pin had to be machined to very close limits for accuracy because this pin, when attached to the adjusting ring had to be in perfect alignment with the hole in the body but, for a `practical working structure, the limits under which the parts were manufactured had to be increased at the sacrifice of accuracy in adjustment of the chasers since any variation in the diameter of the hole or pin obviously would permit a relative rotation between the die body and cap.

Therefore, to overcome this difficulty, the opening vIl in the present instance has been enlarged and a transverse circular opening l2 applied to the die body for the reception of a circular oating or self-centering bushing I3 having a hole M for the reception of the pin I0. The pin l0 is so machined as to .t perfectly the hole I4 and the bushing machined so that it may adjust itself radially of the die and circumferentially of itself but cannot be shifted circumferentially of the die body.

The bushing Vis provided with a flat-milled side l5 so that when inserted in the hole or opening l2 of the body, a headed screw I6 can be inserted in the body in such manner that the head will prevent the bushing from falling out of the die body when the die is being assembled.

Suitable means are provided to permit rotary or circumferential movement of the ring 9 and die body by the usual adjusting means (not shown) relative to the cap 4 for adjusting the chasers to the proper diameter of Work to be threaded and this adjusting means, in the present instance, engages the rearwardly extending projections or ears I1 of the adjusting ring.

Thus, it will be seen that with the present construction, the guide pin l0 may have a tight pressed fit in the ring 9 and any errors in manfacture as to the center distance from the axis of the die will be compensated for by the movement inwardly and outwardly of the bushing I3 as in the direction of the arrows A in Fig. 4. Likewise, this construction will not permit any movement of the bushing in the direction of the arrows B in Fig. 4.

This construction helps in the free action of the die body, especially on fine threads where .the least friction should be applied to help to 'open tliedie head and eliminates any 'side play which will affect the accuracy of the thread to be be cut.

It is to be understood that by describing in detail herein any particular form, structure or arrangement, it is not intended to limit the invention beyond the terms of Vthe several claims or the requirements of the prior art.

Having thus explained the nature of our said invention and described a way of constructing and using the same, although without attempting to set forth all of the forms in which it may -be made or all of the modes of its use, we claim:

1. A threading tool having a Chaser-carrying body, a closing cap, an adjusting member and a oating connection between said adjusting mem' ber and body for effecting `a relative rotation between the body and cap thereby to adjust the `chasers radially, said floating connection comprising a member shiftable radially of Said body.

2. .A threading tool having a chaser-carrying body, a closing cap, an adjusting member and a floating connection between said adjusting member and body for effecting a relative rotation between the body and cap thereby to adjust the chasers radially, said oating connection comprising a member shiftable radially of said body and held against circumferential movement relative to said body.

3. A threading tool having a chaser-carrying body, a closing cap, an adjusting member, and a floating connection between said adjusting member and body for effecting a relative rotation between the body and cap thereby to adjust the chasers radially, said floating connection comprising'a member shiftable radially of said I vbetween the housing and body to adjust the chasers radially, and a floating means connecting said rotatable adjusting member with the body,

said ioating means comprising a member shiftable radially of said body and held against circumferential movement relative to said body.

6. A threading tool having a Chaser-carrying body, a housing on said body, and a rotatable adjusting member to effect a relative rotation between the housing and body to adjust the chasers radially, and a floating means connecting said rotatable adjusting member with the body, said floating means comprising a member kshiftable radially of said body and having rotary movement and held against circumferential movement relative to said body.

7. A threading tool having a Chaser-carrying body member and an opening and closing member for the chasers, one member rotatable relative to the other to eiect radial adjustment of the chasers, an adjusting member and a floating connection between said adjusting member and body member for eiecting the relative rotation between the body member and opening and closing member.

8. A threading tool having a pair of members, one a Chaser-carrying member and one rotatable relative to the other to adjust the chasers radially, an adjusting member, and means oatingly connecting the adjusting member to one of said pair of members for eiecting the relative rotationof said pair of members.

9. A threading tool having a pair of members, one a Chaser-carrying member and one rotatable relative to the other to adjust the chasers radially, an adjusting member, and floating means carried by one of said pair of members and a connection between said floating means and the adjusting member for effecting the relative rotation of said pair of members.

l0. A threading tool having a pair of members, one a Chaser-carrying member and one rotatable relative to the other to adjust the chasers radially, a radially shiftable member carried by one of said pair of members, an adjusting ring, and a pin connecting the adjusting ring with said radially shiftable member and elective to cause the relative rotation of said pair of members upon adjustment of said adjusting ring.

11. A tool comprising a pair of members, one a body member and one a housing member, one of said pair of members adapted to carry a Working instrumentality and one of said pair of members shiftable relative to the other member for shifting said working instrumentality into working position, means for adjusting said working instrumentality radially relative to one of said members, and floating means connecting said adjusting means with one of said pair of members.

DAVID R. POWELL. WILLIAM L. MOORE. 

